package string;

public class StringBuilderDemo1 {
    public static void main(String[] args) {
        String str = "好好学习Java";
        StringBuilder builder = new StringBuilder(str);
        builder.append("。。6");
        System.out.println(str);
        System.out.println(builder);
        builder.replace(8,11,"。。。6");
        System.out.println(builder);
        builder.delete(0,8);
        System.out.println(builder);
        builder.insert(0,"。。6");
        System.out.println(builder);
        builder.reverse();
        System.out.println(builder);

        String a = builder.toString();
        System.out.println(a);
    }
}
